For example, in the ongoing OlympiaN trial (NCT05498155) patients with deleterious/suspected deleterious BRCAm and operable, early-stage, HER2-negative, ER-negative/ER-low breast cancer are assigned olaparib (lower-risk cohort) or olaparib plus durvalumab (higher-risk cohort), and assessed for pCR41. The gene discussed is ESR1; the disease is breast cancer.